8/8:Some light was recently shed on Pittsburgh Steelers wide receiver Antonio Brown's mystery injury, which has kept him out of action for most of the past week. On Tuesday evening, The Athletic's Mark Kaboly reported that Brown's chiropractor, Dr. Michael Wasilisin, posted on his company's Instagram account that the wideout is dealing with a mild hip flexor injury. If the injury is truly mild, Brown should be fully healed in another week or two. Brown is tentatively scheduled to return to practice after the team's preseason game on Thursday night. Provided he doesn't have any setbacks, Brown should be 100% by Week 1.--Matt Terelle - RotoballerSource: Mark Kaboly on Twitter